Wrench



H. 1. HAHN.

WRENCH.

APPLICATION FILED OCT. 10, 1919.

- Patented Dec. 7, 1920.

U ITED STATES HUGO J. HAHN, OF CHICAGO, ILLINOIS.

WRENCH.

neenoao.

Specification of Letters Patent.

Application filed October 10, 1919. Serial No. 329,689.

T 0 all whom it may concern:

Be it known that I, HUeo J. HAHN, a citizen of the United States, and aresident of the city of Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Wrenches;and I do hereby declare that the following is a fulh'clear, and exactdescription of the same, reference being had to the accompanyingdrawings, and to the numerals of reference marked thereon, which form apart of this specification. I

This invention relates to wrenches more particularly to those of thetype in which the adjustment of the jaws is secured by rotating a partof the handle or shank of the wrench.

One of the objects of this invention is to provide a simple form ofwrench in which the operating parts are protected from grit, dirt andthe like with which the wrench may come in contact.

It is also an object of the invention to provide an improved means forkeeping the shanks of the operative parts in their proper relation toeach other. d

Other and further important objects of this invention will be apparentfrom the disclosures in the drawings and specification.

The invention (in a preferred form) is illustrated in the drawings andhereinafter more fully described.

Drawings.

Fig. l is a section on the line 44lof Fig. 2.

Descrp time.

I The wrench comprises a shank l of cylindrical form with a jaw 2rigidly secured thereto. This shank is hollowforthe reception at one endof a hollow shank 3 riveted or otherwise connected to the other jaw 1.This shank 3 is. threaded interiorly for engagement with the threadedend 5 of a handle 6. This handle is rotatively arranged within the shank1 and is prevented from moving axially therein by means of a pin 7passed transversely through the shank 1 and adapted to engage a groove 8in the adjacent part of the handle. At its outer end the handle isprovided with a knurled Patented Dec. '7 192( portion 9 while theadjacent part 10 of the shank 1 is similarly knurled so as to enablethese parts to be firmly gripped for producing a relative rotationtherebetween by means of the hands. means are provided for preventingthe ro tation of the shank 3 and the aw l, so that rotation of thehandle will cause the latter jaw to approach or recede from the aw 2. Inorder to simplify the manufacture, the shank 3 is preferably circular inform. Means are provided externally of the shank for preventing itsrotation within the shank 1. In the first place the sides of the jaw 41are arranged to slide between vertical walls It will be seen that i inthe box-formed jaw 2. Further, laterally extending pins 11 are driveninto holes in the jaw 4 for engagement with slots 12 arranged in theside walls of the jaw 2. Further, the, jaw 4 is provided with a rearwardextension 13 adapted to engage the under side of the rear end of the jaw2 in order to provide against lateral movement of the jaw 4. This isparticularly desirable where the aws are made to extend laterally for aconsiderable distance as shown in the drawings.

In order that the handle may be locked in adjusted position a set screw14 or other looking means may be provided.

I am aware that numerous details of construction may be varied through awide range without departing from the principles of this invention, andI therefore do not purpose limiting the patent granted otherwise thannecessitated by the prior art.

I claim as my invention: v

1. A wrench comprising a yoke-shaped frame constituting one jaw, ahollow shank rigidly connected therewith, a secondjaw slid'able withinsaid frame, a hollow shank connected to the second jaw slidable in thefirst shank, a handle having one portion thereof rotatably mountedwithin the first sh'anlgsaid portion havinga threaded end engagingthreads on the interior of the second shank, means for preventinglongitudinal movement of said handle relatively to the first shank andmeans for preventing rotation of the second shank and jaw relatively tothe first shank whereby rotation of the handle causes said jaws toapproach or recede from each other.

2. A wrench comprising a yoke-shaped frame constituting one jaw, ahollow knurled shank rigidly connected therewith,

a second jaw slidable within said frame, a hollow shank connected to thesecond jaw slidable in the first shank, a knurled handle having oneportion thereof rotatably mounted within the first shank said portionhaving a threaded end engaging threads on the interior of the secondshank, means for preventing longitudinal movement of said handlerelatively to the first shank and means for preventing rotation of thesecond shank and jaw relatively to the first shank whereby rotation ofthe handle causes said jaws to approach or recede from each other.

8. A wrench comprising a jaw of box form, a hollow shank rigidlyconnected therewith, a second jaw slidable within the first jaw having arearwardly extending part adapted to engage the under side of the rearend of the first jaw, a shank connected to the second jaw, a handlehaving one portion thereof rotatably mounted within the first shank,said portion having a threaded end engaging threads on the second shank,means for preventing longitudinal movement of said handle relatively tothe first shank, and means for preventing rotation of the second shankand jaw relatively to the first shank whereby rotation of the handlecauses said jaws to approach or recede from each othe 4. A wrenchcomprising a jaw of box form, a hollow shank rigidly connectedtherewith, a second jaw slidably mounted within the first aw having arearwardly extending part adapted to engage the under side of the rearend of the first jaw and provided with lateral projections extendinginto slots in the side portions of the first jaw, a shank connected tothe second jaw, a handle having one portion thereof rotatably mountedwithin the first shank, said portion having a threaded end engagingthreads on the second shank and means for preventing longitudinalmovement of said handle relatively to the first shank.

5. A wrench comprising a jaw of box form, a hollow shank rigidlyconnected therewith, a second jaw slidably mounted within the first jawhaving arearwardly extending part adapted to engage the under side ofthe rear end of the first jaw and provided with lateral projectionsextending into slots in the side portions of the first shank rigidlyconnected therewith, a second jaw slidable relatively to the first jaw,a hollow shank rigidly connected to the second jaw, a handle having oneportion thereof rotatably mounted within the first shank, said portionhaving a threaded end engaging threads on the interior of the secondshank, the other exposed portion of the shank being of sufiicient lengthto allow the wrench to be operated wholly thereby,

means for preventing rotation of the second shank and jaw relatively tothe first shank whereby rotation of the handle causes said jaws toapproach or recede from each other. '7. if wrench comprising a jaw ofbox form having a lateral extension of V-shaped cross-section, a hollowshank rigidly connected thereto, a second jaw slidable within the firstjaw having a lateral extension of V-shaped cross-section and providedwith a rearward extension adapted to engage the under side of the rearend of the first jaw, a shank connected to the second jaw, a handlehaving one portion thereof rotatably mounted within the first shank,said portionhaving a threaded end engaging threads on the second shank,means for preventing longitudinal movement of said handle relatively tothe first shank, and means for preventing rotation'of the second shankand jaw relatively to the first shankwhereby ro- T tation of the handlecauses said jaws to approach or recede from each other.

In testimony whereof I have hereunto subscribed my name in the presenceof two subscribing witnesses.

HUGO. J. HAHN.

Witnesses:

E. J WHITLOW, RUDY VON GUN'roN.

